(a)[3]
Link each blood component to its function by drawing a line between them. One example has already been completed for you.
(b(i))[3]
Explain how a red blood cell is adapted for oxygen transport.
(b(ii))[2]
The number of red blood cells in $1 \text{ mm}^3$ of blood is known as the red blood cell count. For a female, a normal red blood cell count is $4.2$-$5.4$ million cells in $1 \text{ mm}^3$ of blood. Suggest two factors that could cause the red blood cell count in a $25$ year-old female to change.